JPH0143220B2 - - Google Patents
Info
- Publication number
- JPH0143220B2 JPH0143220B2 JP10673184A JP10673184A JPH0143220B2 JP H0143220 B2 JPH0143220 B2 JP H0143220B2 JP 10673184 A JP10673184 A JP 10673184A JP 10673184 A JP10673184 A JP 10673184A JP H0143220 B2 JPH0143220 B2 JP H0143220B2
- Authority
- JP
- Japan
- Prior art keywords
- hot water
- water
- heat pump
- circulation pump
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 150
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D17/00—Domestic hot-water supply systems
- F24D17/02—Domestic hot-water supply systems using heat pumps
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、ヒートポンプを用いて貯湯槽の水
を加熱する給湯用ヒートポンプ装置の流量制御装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flow rate control device for a heat pump device for hot water supply that heats water in a hot water storage tank using a heat pump.
従来、この種の装置としては第１図に示すもの
があつた。この第１図において、１は加熱用のヒ
ートポンプ、２は貯湯槽である。ヒートポンプ１
と貯湯槽２は水配管３ａ，３ｂで連結されてお
り、水配管３ｂには循環ポンプ４が設けられてい
る。
Conventionally, there has been a device of this type as shown in FIG. In FIG. 1, 1 is a heat pump for heating, and 2 is a hot water storage tank. heat pump 1
and the hot water storage tank 2 are connected by water pipes 3a and 3b, and a circulation pump 4 is provided in the water pipe 3b.
また、水配管３ｂにおいて、貯湯槽２と循環ポ
ンプ４間には、市水合流分岐８があり、この市水
合流分岐８と市水取入口５との間の水補給配管８
ａには、電磁弁６、流量調整用電動弁７が設けら
れている。 In addition, in the water pipe 3b, there is a city water merging branch 8 between the hot water storage tank 2 and the circulation pump 4, and a water supply pipe 8 between this city water merging branch 8 and the city water intake 5.
A is provided with a solenoid valve 6 and a flow rate adjustment electric valve 7.
貯湯槽２には温度センサ１２と水位レベルスイ
ツチ１４が設けられており、ヒートポンプ１の出
口側の水配管３ａにも温度センサ１５が設けられ
ている。温度センサ１２，１５、水位レベルスイ
ツチ１４の出力は制御装置１３に送られるように
なつている。この制御装置１３により、循環ポン
プ４、電磁弁６、流量調整用電動弁７、ヒートポ
ンプ１を制御するようになつている。さらに、貯
湯槽２には、負荷側の水配管９が連結されてお
り、この水配管９には、負荷側の循環ポンプ１０
が設けられており、また、複数個の給湯用の蛇口
１１が設けられいる。 The hot water storage tank 2 is provided with a temperature sensor 12 and a water level switch 14, and the water pipe 3a on the outlet side of the heat pump 1 is also provided with a temperature sensor 15. The outputs of the temperature sensors 12 and 15 and the water level switch 14 are sent to a control device 13. This control device 13 controls the circulation pump 4, the electromagnetic valve 6, the electric flow rate adjustment valve 7, and the heat pump 1. Further, a water pipe 9 on the load side is connected to the hot water storage tank 2, and a circulation pump 10 on the load side is connected to the water pipe 9.
A plurality of faucets 11 for supplying hot water are also provided.
次に動作について説明する。この給湯用ヒート
ポンプ装置では、負荷側の循環ポンプ１０は常時
運転されており、蛇口１１より温水が使用される
と、貯湯槽２への還水が減少し、貯湯槽２内の水
位は満水位レベルＡより下がる。 Next, the operation will be explained. In this heat pump device for hot water supply, the circulation pump 10 on the load side is constantly operated, and when hot water is used from the faucet 11, the water returned to the hot water tank 2 decreases, and the water level in the hot water tank 2 reaches the full water level. Lower than level A.
この水位の低下は水位レベルスイツチ１４によ
り検出され、制御装置１３により電磁弁６が開
き、ヒートポンプ１および循環ポンプ４が駆動す
る。 This drop in the water level is detected by the water level switch 14, and the control device 13 opens the solenoid valve 6, thereby driving the heat pump 1 and circulation pump 4.
貯湯槽２への給水は、市水取入口５から電磁弁
６、流量調整用電動弁７を介して水補給配管８ａ
を通つて市水合流分岐８へ至り、水配管３ｂを介
して循環ポンプ４に吸い込まれ、ヒートポンプ１
で加熱されて、水配管３ａを通つて貯湯槽２へ供
給される。 Water is supplied to the hot water tank 2 from the city water intake 5 via a solenoid valve 6 and a flow rate adjustment electric valve 7 to a water supply pipe 8a.
The city water reaches the confluence branch 8 through the water pipe 3b, is sucked into the circulation pump 4, and is then pumped into the heat pump 1.
The hot water is heated and supplied to the hot water storage tank 2 through the water pipe 3a.
このとき、給水量はヒートポンプ１の出口の水
温が設定値（例えば55℃）になるように、温度セ
ンサ１５の検知信号で制御装置１３により開度が
調整された流量調整用電動弁７により制御され
る。すなわち、温度センサ１５による検出温度が
設定値より低いと電動弁７は次第に閉じて市水の
補給を減じ、また温度が上昇するに従つて電動弁
が次第に開いて市水の補給を増す。そして、ヒー
トポンプ１への流入水量は一定なので、その不足
分の水は貯湯槽２より供給され、補給される市水
と混合した水がヒートポンプ１へ流入する。 At this time, the amount of water supplied is controlled by the electric flow rate adjustment valve 7 whose opening degree is adjusted by the control device 13 based on the detection signal of the temperature sensor 15 so that the water temperature at the outlet of the heat pump 1 reaches the set value (for example, 55°C). be done. That is, when the temperature detected by the temperature sensor 15 is lower than the set value, the motorized valve 7 gradually closes to reduce the supply of city water, and as the temperature rises, the motorized valve gradually opens to increase the supply of city water. Since the amount of water flowing into the heat pump 1 is constant, the insufficient water is supplied from the hot water storage tank 2, and water mixed with city water to be replenished flows into the heat pump 1.
このようにして、貯湯槽２へ一定温度の温水が
供給されて次第に温度が上がる。貯湯槽２の水位
は次第に上がり、満水位レベルＡに達すると、電
磁弁６を閉じ、ヒートポンプ１、循環ポンプ４は
停止する。熱損失により貯湯槽２の水温が設定値
（例えば50℃）以下に下がると、温度センサ１２
により検出され、制御装置１３によりヒートポン
プ１、循環ポンプ４を駆動して保温運転を行な
う。 In this way, hot water at a constant temperature is supplied to the hot water tank 2, and the temperature gradually increases. The water level in the hot water storage tank 2 gradually rises, and when it reaches the full water level A, the solenoid valve 6 is closed and the heat pump 1 and circulation pump 4 are stopped. When the water temperature in the hot water tank 2 drops below a set value (for example, 50°C) due to heat loss, the temperature sensor 12
is detected, and the control device 13 drives the heat pump 1 and the circulation pump 4 to perform a heat retention operation.
以上のように構成された従来の給湯用ヒートポ
ンプ装置では、循環ポンプ４の流量が一定のた
め、急激に給湯して貯湯槽２の水位が下がると循
環ポンプ４が空気を吸い込むおそれがある。この
ため、貯湯槽２の水位が下がると、一時的に貯湯
槽２に多量の市水を補給しなければならず、従つ
てヒートポンプの立ち上がり時には、貯湯槽２の
水温は設定温度にならないという欠点があつた。 In the conventional heat pump device for hot water supply configured as described above, since the flow rate of the circulation pump 4 is constant, there is a risk that the circulation pump 4 may suck in air if hot water is suddenly supplied and the water level in the hot water storage tank 2 falls. For this reason, when the water level in the hot water storage tank 2 drops, a large amount of city water must be temporarily replenished into the hot water storage tank 2. Therefore, when the heat pump starts up, the water temperature in the hot water storage tank 2 does not reach the set temperature. It was hot.
この発明はかかる欠点を改善する目的でなされ
たもので、貯湯槽の循環ポンプ側水配管に電磁弁
を取り付け、貯湯槽からの温水の流出を防ぎ、ま
たヒートポンプの出口側温度を温度センサで検出
し、市水取入口に設けた流量調整用電動弁とイン
バータの取り付けられた循環ポンプ４を制御する
ことにより、設定温度の温水から得られる給湯用
ヒートポンプ装置を提案するものである。
This invention was made for the purpose of improving such drawbacks.A solenoid valve is attached to the water piping on the circulation pump side of the hot water storage tank to prevent hot water from flowing out from the hot water storage tank, and the temperature on the outlet side of the heat pump is detected by a temperature sensor. The present invention proposes a heat pump device for hot water supply that can obtain hot water at a set temperature by controlling a circulation pump 4 equipped with an inverter and an electric valve for flow rate adjustment provided at a city water intake.
以下、この発明の給湯用ヒートポンプ装置を第
２図、第３図について説明する。
Hereinafter, the heat pump device for hot water supply according to the present invention will be explained with reference to FIGS. 2 and 3.
第２はその一実施例を示す構成図であり、図中
第１図と同一部分には同一符号を付してその説明
を省略し、１６は市水合流分岐８と貯湯槽２の間
の水配管３ｂに設けられた電磁弁であり、この電
磁弁１６は、貯湯槽２への温水補給時に貯湯槽２
から水配管３ｂへの温水の流出を防ぐために設け
られたものである。１７は循環ポンプ４の流出を
調整するために設けられたインバータである。制
御装置１８は第１図に示す従来の制御装置１３の
機能に加えて、温度センサ１５からの信号で電磁
弁１６および循環ポンプ４に取り付けられたイン
バータ１７に対しても動作するように構成されて
いる。なお、その他の構成は第１図に示すものと
同様である。 The second is a configuration diagram showing one embodiment of the same, in which the same parts as in FIG. This is a solenoid valve provided in the water pipe 3b, and this solenoid valve 16 is used when replenishing hot water to the hot water tank
This is provided to prevent hot water from flowing out from the pipe 3b to the water pipe 3b. 17 is an inverter provided to adjust the outflow of the circulation pump 4. In addition to the functions of the conventional control device 13 shown in FIG. 1, the control device 18 is configured to operate the solenoid valve 16 and the inverter 17 attached to the circulation pump 4 in response to a signal from the temperature sensor 15. ing. Note that the other configurations are the same as those shown in FIG.
次にこの発明の給湯用ヒートポンプ装置の動作
を第３図のフローチヤートを参照して説明する。 Next, the operation of the heat pump device for hot water supply according to the present invention will be explained with reference to the flowchart shown in FIG.
ヒートポンプのスタート時には、電磁弁１６は
閉じ、電磁弁６、流量調整用電磁弁７が開いてい
る（ステツプS1）。 When the heat pump starts, the solenoid valve 16 is closed, and the solenoid valve 6 and the flow rate adjustment solenoid valve 7 are open (step S1).
循環ポンプ４およびヒートポンプ１が駆動し
（ステツプS2）、水補給配管８ａの市水取入口５
から市水が電磁弁６、流量調整用電動弁７を経て
水配管３ｂを介して循環ポンプ４でヒートポンプ
１へ送られ、ここで加熱されて市水が温水になり
貯湯槽２へ供給される。この時、給水量はヒート
ポンプ１の出口側水温が、例えば55℃など一定と
なるように開度調整された流量調整用電動弁７と
流動調整された循環ポンプ４によつて制御される
（ステツプS3）。すなわち温度センサ１５による
検出温度が設定値より低いと、流量調整用電動弁
７は次第に閉じて行き、市水の供給量を減らし、
インバータ１７の周波数を下げて、循環ポンプ４
の流量を減らす。また、温度が上昇するにつれて
流量調整用電動弁７は開いて行き、市水の供給量
を増し、インバータ１７の周波数を上げて、循環
ポンプ４の流量を増す。このようにして、貯湯槽
２内へ一定温度の温水が供給されて行き、貯湯槽
２の水位が満水位レベルＡに達すると（ステツプ
S4）、これを水位レベルスイツチ１４が検出し
て、電磁弁６が閉じ、ヒートポンプ１、循環ポン
プ４が停止する（ステツプS5）。 The circulation pump 4 and the heat pump 1 are driven (step S2), and the city water intake port 5 of the water supply pipe 8a is activated.
The city water is sent to the heat pump 1 by the circulation pump 4 via the solenoid valve 6 and the electric valve 7 for flow rate adjustment via the water piping 3b, where it is heated and the city water becomes hot water and is supplied to the hot water tank 2. . At this time, the amount of water supplied is controlled by the electric flow rate adjustment valve 7 whose opening is adjusted and the circulation pump 4 whose flow is adjusted so that the water temperature on the outlet side of the heat pump 1 is constant, for example, 55°C. S3). That is, when the temperature detected by the temperature sensor 15 is lower than the set value, the flow rate adjustment electric valve 7 gradually closes, reducing the amount of city water supplied.
By lowering the frequency of the inverter 17, the circulation pump 4
Reduce the flow rate. Further, as the temperature rises, the electric flow rate regulating valve 7 opens, increasing the amount of city water supplied, increasing the frequency of the inverter 17, and increasing the flow rate of the circulation pump 4. In this way, hot water at a constant temperature is supplied into the hot water tank 2, and when the water level in the hot water tank 2 reaches the full water level A (step
S4), this is detected by the water level switch 14, the solenoid valve 6 closes, and the heat pump 1 and circulation pump 4 are stopped (step S5).
一方負荷側の循環ポンプ４は常時運転されてお
り、蛇口１１より温水が使用されると、貯湯槽２
への還水が減じ、貯湯槽２内の水位は満水位レベ
ルＡより下がる。 On the other hand, the circulation pump 4 on the load side is always operated, and when hot water is used from the faucet 11, the hot water tank 2
The water returned to the hot water storage tank 2 decreases, and the water level in the hot water tank 2 falls below the full water level A.
この水位の低下は水位レベルスイツチ１４によ
り検出され（ステツプS6）、制御装置１８により
電磁弁１６、電磁弁６、流量調整用電動弁７が開
き、ヒートポンプ１および循環ポンプ４が駆動さ
れ、上述の動作を繰り返えす。 This drop in water level is detected by the water level switch 14 (step S6), and the control device 18 opens the solenoid valve 16, the electromagnetic valve 6, and the electric valve 7 for flow rate adjustment, and drives the heat pump 1 and the circulation pump 4, and the above-mentioned Repeat the action.
上記ステツプS6で貯湯槽２が満水状態で、熱
損失により、貯湯槽２の水温が例えば50℃などの
設定値T1より下がると、温度センサ１５により
検出され（ステツプS7）、制御装置１８により電
磁弁６および流量調整用電動弁７は閉じたまま
で、電磁弁１６を開き（ステツプS8）、ヒートポ
ンプ１、循環ポンプ４を駆動して保温運転を行な
う（ステツプS9）。このときインバータ１７の周
波数を上げることにより、ヒートポンプ１の出口
側水温が上がりすぎないように循環ポンプ４の流
量を調整しつつ、貯湯槽２内の温水だけが循環さ
れる（ステツプS10）。保温運転は貯湯槽２内の
水温が設定値以上になるまで行なう（ステツプ
S11）。 If the water temperature of the hot water tank 2 falls below the set value T1, such as 50°C, due to heat loss while the hot water tank 2 is full in step S6, it is detected by the temperature sensor 15 (step S7), and the control device 18 While the solenoid valve 6 and the electric flow rate adjustment valve 7 remain closed, the solenoid valve 16 is opened (step S8), and the heat pump 1 and the circulation pump 4 are driven to perform a heat retention operation (step S9). At this time, by increasing the frequency of the inverter 17, only the hot water in the hot water tank 2 is circulated while adjusting the flow rate of the circulation pump 4 so that the water temperature on the outlet side of the heat pump 1 does not rise too much (step S10). The heat retention operation is performed until the water temperature in the hot water tank 2 reaches the set value or higher (step
S11).
なお、上述した実施例では、給湯用ヒートポン
プ装置について説明したが、この発明は、暖房、
冷房や給湯と暖房、冷房を兼ねるヒートポンプ装
置にも適用できる。 In addition, in the above-mentioned embodiment, a heat pump device for hot water supply was explained, but this invention also applies to heating,
It can also be applied to heat pump devices that serve both air conditioning, hot water supply, heating, and cooling.
この発明は以上説明したとおり、貯湯槽２へ温
水を供給する場合、貯湯槽２とヒートポンプ１を
結ぶ水配管に設けた電磁弁１６を閉じることによ
り、循環ポンプ４が貯湯槽２内の温水を吸い込む
のを防ぐため、急激に負荷が発生し貯湯槽２内の
水位が下がつた場合にも、循環ポンプ４が空気を
吸い込むおそれがない。また、ヒートポンプ１の
出口側水温が一定となるように、給水量を調節で
きるため、ヒートポンプ立ち上がり時にも一定温
度の温水が得られる。更にまた、保温の場合には
インバータを高い周波数で運転することにより、
効率がよく、かつ速やかに保温できるという効果
がある。
As explained above, when supplying hot water to the hot water storage tank 2, the circulation pump 4 supplies hot water in the hot water storage tank 2 by closing the solenoid valve 16 provided in the water pipe connecting the hot water storage tank 2 and the heat pump 1. Since air is prevented from being sucked in, even if a load suddenly occurs and the water level in the hot water storage tank 2 drops, there is no risk that the circulation pump 4 will suck in air. Furthermore, since the water supply amount can be adjusted so that the water temperature on the outlet side of the heat pump 1 is constant, hot water at a constant temperature can be obtained even when the heat pump starts up. Furthermore, in the case of heat retention, by operating the inverter at a high frequency,
It has the effect of being efficient and quickly retaining heat.
第１図は従来の給湯用ヒートポンプ装置の構成
を示す図、第２図はこの発明の給湯用ヒートポン
プ装置の一実施例の構成を示す図、第３図は第２
図の制御を示すフローチヤートである。
１……ヒートポンプ、２……貯湯槽、３ａ，３
ｂ……水配管、４……循環ポンプ、５……市水取
入口、６……電磁弁、７……流量調整用電動弁、
８……市水合流分岐、８ａ……水補給配管、９…
…負荷側の水配管、１０……循環ポンプ、１１…
…蛇口、１２，１５……温度センサ、１３……制
御装置、１４……水位レベルスイツチ、１６……
電磁弁、１７……インバータ、１８……制御装
置。なお、図中同一符号は同一または相当部分を
示す。
FIG. 1 is a diagram showing the configuration of a conventional heat pump device for hot water supply, FIG. 2 is a diagram showing the configuration of an embodiment of the heat pump device for hot water supply of the present invention, and FIG.
3 is a flowchart showing the control shown in FIG. 1...Heat pump, 2...Hot water tank, 3a, 3
b...Water piping, 4...Circulation pump, 5...Municipal water intake, 6...Solenoid valve, 7...Electric valve for flow rate adjustment,
8...City water confluence branch, 8a...Water supply pipe, 9...
...Water piping on the load side, 10...Circulation pump, 11...
... Faucet, 12, 15 ... Temperature sensor, 13 ... Control device, 14 ... Water level switch, 16 ...
Solenoid valve, 17...inverter, 18...control device. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
を連通する水配管と、この水配管の一方に設けた
循環ポンプと、市水を電磁弁および流量調整可能
な電動弁を介して上記循環ポンプを設けた水配管
に流入させる水補給配管とを備えた給湯用ヒート
ポンプ装置において、上記ヒートポンプの出口側
温水温度を検出する第１の温度センサおよび貯湯
槽の温水温度を検出する第２の温度センサと貯湯
槽の水位センサからの信号をもとに各種の制御指
令を送出する制御装置と、上記貯湯槽とヒートポ
ンプを結ぶ水配管に設けられ市水供給時上記制御
装置からの指令で閉動作する電磁弁と、上記循環
ポンプを上記第１の温度センサの検出温度にもと
づく上記制御装置からの指令により流量制御する
インバータとを有することを特徴とする給湯用ヒ
ートポンプ装置。1. A heat pump and a hot water storage tank, a water pipe that communicates between them, a circulation pump installed on one side of the water pipe, and a circulation pump that connects city water through a solenoid valve and an electric valve that can adjust the flow rate. A heat pump device for hot water supply comprising a water supply pipe that flows into the water pipe, a first temperature sensor that detects the hot water temperature at the outlet side of the heat pump, a second temperature sensor that detects the hot water temperature of the hot water storage tank, and the hot water storage tank. a control device that sends various control commands based on signals from the water level sensor; and a solenoid valve that is installed in the water piping connecting the hot water tank and the heat pump and closes based on a command from the control device when city water is supplied. and an inverter that controls the flow rate of the circulation pump based on a command from the control device based on the temperature detected by the first temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59106731A JPS60248946A (en) | 1984-05-23 | 1984-05-23 | Heat pump device for hot water supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59106731A JPS60248946A (en) | 1984-05-23 | 1984-05-23 | Heat pump device for hot water supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60248946A JPS60248946A (en) | 1985-12-09 |
| JPH0143220B2 true JPH0143220B2 (en) | 1989-09-19 |
Family
ID=14441076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59106731A Granted JPS60248946A (en) | 1984-05-23 | 1984-05-23 | Heat pump device for hot water supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60248946A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005201538A (en) * | 2004-01-15 | 2005-07-28 | Sunpot Co Ltd | Heat pump type water heater |
| JP2007263523A (en) * | 2006-03-29 | 2007-10-11 | Nishihara Engineering Co Ltd | Hot water supply system |
| JP5882160B2 (en) * | 2012-08-01 | 2016-03-09 | 東京電力株式会社 | Hot water system |
| CN103292477B (en) * | 2013-06-24 | 2015-05-20 | 江苏天舒电器有限公司 | PLC-and-MCGS-based heat pump system monitoring method and air source heat pump hot-water system thereof |
| CN103277900B (en) * | 2013-06-24 | 2015-05-20 | 江苏天舒电器有限公司 | Programmable logic controller (PLC) based monitor and control generated system (MCGS) heat pump monitoring system and control method thereof |
| CN103868242B (en) * | 2014-02-26 | 2016-04-20 | 苏州市职业大学 | A kind of water-saving control device |
| CN104654581B (en) * | 2015-02-11 | 2017-06-23 | 四川蓉幸实业有限公司 | A kind of slaughtering animal is with the closed hot water automatic heat exchange circulatory system |
| CN106152539A (en) * | 2016-08-26 | 2016-11-23 | 德奥电器科技长兴有限公司 | Thermostatic electric water heater |
-
1984
- 1984-05-23 JP JP59106731A patent/JPS60248946A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60248946A (en) | 1985-12-09 |
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